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STUDIES ON THE LABORATORY DEVELOPMENT OF RESISTANCE AND CROSS-RESISTANCE OF COTTON BOLLWORM TO DELTAMETHRIN, CYHALOTHRIN AND A MIXTURE CONTAINED CYHALOTHRIN RUST RESISTANCE IDENTIFICATION METHOD AND THE SCREENING OF RESISTANCE AMONG SOME CHINESE SNAP BEAN GERMPLASM RESOURCES Streptomycin-resistant Rational Screening for High-yield Neomycin Producing Strain Screening of Prolific Micromonospora carbonacea in Antibiotics Production by Heat Mutagenesis The relationship between the content of cotton leaf chlorophyll and waxiness and leaf thickness and the cotton resistance to Apolygus lucorum Screening and Evaluation of Maize Germplasm for Resistance to Five Diseases and Asian Corn Borer Optimization of regeneration system and resistance screening of Rhodiola crenulata Screening and Evaluation of Maize Germplasm for Resistance to Five Diseases and Asian Corn Borer